The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 2004
Filed:
Feb. 22, 2000
Hideto Horikoshi, Sagamihara, JP;
Naoki Abe, Yamato, JP;
Jun Tanaka, Zama, JP;
Tomoki Maruichi, Yamato, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
To provide a method whereby unauthorized data access by an RFID data processing system is prohibited without any degradation of performance being incurred. An RFID data processing system comprises a CPU , a EEPROM , communication devices and , and power controllers and . When an RFID data processing system in the power-ON state that does not have access authorization passes through a portal gate located at the entrance to an unauthorized data access protection area, the portal gate transmits a signal to set ON a tamper bit in the EEPROM . When the tamper bit has been set ON, a tamper bit interrupt request signal is output by the EEPROM . Upon receiving this signal, the power controllers and power off the RFID data processing system